<template>
  <el-container class="home_container">
    <!-- 头部 -->
    <el-header>
      <div>
        <img src="../assets/logo4.jpg" alt="" />
        <span>水果后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px':'200px'" >
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu
          router
          :collapse="isCollapse"
          :collapse-transition="false"
          :default-active="activePath"
          unique-opened
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409EFF"
        >
          <!-- 一级菜单 -->
          <el-menu-item :index="'/welcome'" @click="saveNavState('/welcome')">
            <i class="el-icon-s-home"></i>
            <span>首页</span>
          </el-menu-item>  
          <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" 
            @click="saveNavState('/'+subItem.path)"> 
              <i class="el-icon-menu"></i>
              <!-- 文本 -->
              <span>{{subItem.authName}}</span>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容 -->
      <el-main>
          <!-- 路由占位符 -->
          <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
    data(){
        return{
            // 左侧菜单数据
            menuList:[],
            // 图标
            iconsObj:{
                '100':'el-icon-user-solid',
                '101':'el-icon-s-goods',
                '102':'el-icon-tickets'
            },
            // 是否折叠
            isCollapse:false,
            // 被激活的链接地址
            activePath:''
        }
    },
   watch:{
    $route:{
      handler(){
        this.activePath = window.sessionStorage.getItem('activePath')
      },
      // 深度观察监听
      deep: true
    }
  },
    created(){
        this.getMenuList()
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
        // 退出登录
        logout() {
        window.sessionStorage.clear();
        this.$message.success("退出成功");
        this.$router.push("/login");
        },
        // 获取所有的菜单
        async getMenuList(){
           const res = await this.$http.get('/menus').catch(()=>{
               this.$message.error('获取菜单数据失败')
           })
           if(res.status == 200){
               this.menuList = res.data
            //    this.$message.success('获取菜单数据成功')
           }
        },
        // 点击按钮，切换菜单的折叠与展开
        toggleCollapse(){
            this.isCollapse = !this.isCollapse
        },
        // 保存菜单的点击状态
        saveNavState(activePath){
            window.sessionStorage.setItem('activePath',activePath)
            this.activePath = activePath
        }
    },
};
</script>

<style lang="less" scoped>
.home_container {
  height: 100%;
}
.el-header {
  // padding:0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: #333744;
  color: #fff;
  font-weight: bold;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
  img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
  }
}
.el-aside {
  transition: all 0.3s;  
  background-color: #333744;
  .el-menu{
      border-right: none;
  }
}

.el-main {
  background-color: #eaedf1;
}
.toggle-button{
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor:pointer;
    user-select:none;
}
</style>